“A Rush and a Push and the Land is Ours” is about anal sex.
A ‘Rush’ describes sniffing amyl nitrate to make entry easier, and the accompanying headrush, a ‘push’ is, well, i’m sure you can imagine, and ‘the land is ours’ describes the fact that the couple are now joined anatomically. Also notice Morrissey’s glottal growling, probably an indication of the sounds you can expect to hear during the above scenario. The narrator is possibly describing a visit to a male prostitute (a theme again explored in ‘You Have Killed Me’), and the fact he doesn’t want love, because that would inevitably involve a reciprocated physical act - one that causes too much ‘strain’ and ‘pain’. The “mystical time zone” may refer to that fact that amyl nitrate can also induce an altered perception of time. Despite stretched time, the encounter with the prostitute is brief, and soon the narrator is home in his own bed, fearing capital repercussions.